Police and the B.C. Coroners Service are investigating the deaths after recovering two bodies Sunday afternoon from Kwitzil Lake, which is on the side of Highway 16, approximately 40 kilometres west of the city.

Prince George RCMP said the area was the site of a large overnight party with hundreds of people in attendance. (CBC)

Officers say the lake, which is also known as Gravel Pit Lake, was the site of a huge party attended by hundreds late Saturday night. Police were called to the scene at around 4 a.m. PT Sunday after the vehicle went into the water.

Friends of the two people who died have been reporting on social media that they were attending a high school graduation party, and that others in attendance jumped in to the lake to try to rescue the pair.

The high school both victims are believed to have attended, D.P. Todd Secondary, posted a statement via Twitter Sunday afternoon: "Please everyone breathe deep and take care. School will have supports in place for Tue."

Info coming in about the tragedy at gravel pit lake. Please everyone breathe deep and take care. School will have supports in place for Tue.